What Is The Oldest Mountain Range In The U.S.?

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The Oldest Mountain range in the United States are the Appalachian Mountains. They consist of Taconic Orogeny (Ordovician);Acadian Orogeny (Devonian);Caledonian Orogeny
(Silurian); Allegheny Orogeny (Pennsylvanian & Permian). They are located in Eastern North America.

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